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-rw-r--r--sound/soc/codecs/wm8993.c54
1 files changed, 45 insertions, 9 deletions
diff --git a/sound/soc/codecs/wm8993.c b/sound/soc/codecs/wm8993.c
index e97b3f4..bf022f6 100644
--- a/sound/soc/codecs/wm8993.c
+++ b/sound/soc/codecs/wm8993.c
@@ -923,10 +923,33 @@ static const struct snd_soc_dapm_route routes[] = {
{ "Right Headphone Mux", "DAC", "DACR" },
};
+static void wm8993_cache_restore(struct snd_soc_codec *codec)
+{
+ u16 *cache = codec->reg_cache;
+ int i;
+
+ if (!codec->cache_sync)
+ return;
+
+ /* Reenable hardware writes */
+ codec->cache_only = 0;
+
+ /* Restore the register settings */
+ for (i = 1; i < WM8993_MAX_REGISTER; i++) {
+ if (cache[i] == wm8993_reg_defaults[i])
+ continue;
+ snd_soc_write(codec, i, cache[i]);
+ }
+
+ /* We're in sync again */
+ codec->cache_sync = 0;
+}
+
static int wm8993_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
struct wm8993_priv *wm8993 = codec->private_data;
+ int ret;
switch (level) {
case SND_SOC_BIAS_ON:
@@ -940,6 +963,13 @@ static int wm8993_set_bias_level(struct snd_soc_codec *codec,
case SND_SOC_BIAS_STANDBY:
if (codec->bias_level == SND_SOC_BIAS_OFF) {
+ ret = regulator_bulk_enable(ARRAY_SIZE(wm8993->supplies),
+ wm8993->supplies);
+ if (ret != 0)
+ return ret;
+
+ wm8993_cache_restore(codec);
+
/* Tune DC servo configuration */
snd_soc_write(codec, 0x44, 3);
snd_soc_write(codec, 0x56, 3);
@@ -992,6 +1022,18 @@ static int wm8993_set_bias_level(struct snd_soc_codec *codec,
snd_soc_update_bits(codec, WM8993_POWER_MANAGEMENT_1,
WM8993_VMID_SEL_MASK | WM8993_BIAS_ENA,
0);
+
+#ifdef CONFIG_REGULATOR
+ /* Post 2.6.34 we will be able to get a callback when
+ * the regulators are disabled which we can use but
+ * for now just assume that the power will be cut if
+ * the regulator API is in use.
+ */
+ codec->cache_sync = 1;
+#endif
+
+ regulator_bulk_disable(ARRAY_SIZE(wm8993->supplies),
+ wm8993->supplies);
break;
}
@@ -1460,15 +1502,7 @@ static int wm8993_resume(struct platform_device *pdev)
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
struct wm8993_priv *wm8993 = codec->private_data;
- u16 *cache = wm8993->reg_cache;
- int i, ret;
-
- /* Restore the register settings */
- for (i = 1; i < WM8993_MAX_REGISTER; i++) {
- if (cache[i] == wm8993_reg_defaults[i])
- continue;
- snd_soc_write(codec, i, cache[i]);
- }
+ int ret;
wm8993_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
@@ -1584,6 +1618,8 @@ static int wm8993_i2c_probe(struct i2c_client *i2c,
if (ret != 0)
goto err_enable;
+ codec->cache_only = 1;
+
/* By default we're using the output mixers */
wm8993->class_w_users = 2;